This was a fabulous tour. The people who run it were fan-freaken-tastic. Seriously was an amazing tour and so much fun. They never pushed us to go faster etc. and were really well prepared.
As everyone has stated here remember:
1) you will be covered in dust.
2) use the bathroom before you get on them as it'll be about a few hours before you see one again.
3) have the best time of your life!!!